[PATCH 6.12.y] s390: Revert support for DCACHE_WORD_ACCESS

[Heiko Carstens <hca@linux.ibm.com>]

load_unaligned_zeropad() reads eight bytes from unaligned addresses and may
cross page boundaries. It handles exceptions which may happen if reading
from the second page results in an exception.

For pages which are donated to the Ultravisor for secure execution purposes
the do_secure_storage_access() exception handler however does not handle
such exceptions correctly. Such an exception may result in an endless
exception loop which will never be resolved.

An attempt to fix this [1] turned out to be not sufficient. For now revert
load_unaligned_zeropad() until this problem has been resolved in a proper
way.

Note that the implementation of load_unaligned_zeropad() itself is
correct. The revert is just a temporary workaround until there is complete
fix for secure storage access exceptions.

[1] commit b00be77302d7 ("s390/mm: Add missing secure storage access fixups for donated memory")

Fixes: 802ba53eefc5 ("s390: add support for DCACHE_WORD_ACCESS")
Cc: stable@vger.kernel.org
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
(cherry picked from commit 37540b8c287fc817bdbd0c62bb75ad6eab0e5d03)
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
 arch/s390/Kconfig                      |  1 -
 arch/s390/include/asm/asm-extable.h    |  4 ----
 arch/s390/include/asm/word-at-a-time.h | 22 ----------------------
 arch/s390/mm/extable.c                 | 18 ------------------
 4 files changed, 45 deletions(-)

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 5e6aebf1b739..28e900e5212c 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -137,7 +137,6 @@ config S390
 	select ARCH_WANT_LD_ORPHAN_WARN
 	select BUILDTIME_TABLE_SORT
 	select CLONE_BACKWARDS2
-	select DCACHE_WORD_ACCESS if !KMSAN
 	select DYNAMIC_FTRACE if FUNCTION_TRACER
 	select FUNCTION_ALIGNMENT_8B if CC_IS_GCC
 	select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC
diff --git a/arch/s390/include/asm/asm-extable.h b/arch/s390/include/asm/asm-extable.h
index 00a67464c445..f87e06ec86ac 100644
--- a/arch/s390/include/asm/asm-extable.h
+++ b/arch/s390/include/asm/asm-extable.h
@@ -13,7 +13,6 @@
 #define EX_TYPE_UA_LOAD_MEM	4
 #define EX_TYPE_UA_LOAD_REG	5
 #define EX_TYPE_UA_LOAD_REGPAIR	6
-#define EX_TYPE_ZEROPAD		7
 #define EX_TYPE_FPC		8
 
 #define EX_DATA_REG_ERR_SHIFT	0
@@ -82,9 +81,6 @@
 #define EX_TABLE_UA_LOAD_REGPAIR(_fault, _target, _regerr, _regzero)	\
 	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REGPAIR, _regerr, _regzero, 0)
 
-#define EX_TABLE_ZEROPAD(_fault, _target, _regdata, _regaddr)		\
-	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_ZEROPAD, _regdata, _regaddr, 0)
-
 #define EX_TABLE_FPC(_fault, _target)					\
 	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FPC, __stringify(%%r0), __stringify(%%r0), 0)
 
diff --git a/arch/s390/include/asm/word-at-a-time.h b/arch/s390/include/asm/word-at-a-time.h
index 203acd6e431b..e9287036392d 100644
--- a/arch/s390/include/asm/word-at-a-time.h
+++ b/arch/s390/include/asm/word-at-a-time.h
@@ -4,7 +4,6 @@
 
 #include <linux/bitops.h>
 #include <linux/wordpart.h>
-#include <asm/asm-extable.h>
 #include <asm/bitsperlong.h>
 
 struct word_at_a_time {
@@ -41,25 +40,4 @@ static inline unsigned long zero_bytemask(unsigned long data)
 	return ~1UL << data;
 }
 
-/*
- * Load an unaligned word from kernel space.
- *
- * In the (very unlikely) case of the word being a page-crosser
- * and the next page not being mapped, take the exception and
- * return zeroes in the non-existing part.
- */
-static inline unsigned long load_unaligned_zeropad(const void *addr)
-{
-	unsigned long data;
-
-	asm volatile(
-		"0:	lg	%[data],0(%[addr])\n"
-		"1:	nopr	%%r7\n"
-		EX_TABLE_ZEROPAD(0b, 1b, %[data], %[addr])
-		EX_TABLE_ZEROPAD(1b, 1b, %[data], %[addr])
-		: [data] "=d" (data)
-		: [addr] "a" (addr), "m" (*(unsigned long *)addr));
-	return data;
-}
-
 #endif /* _ASM_WORD_AT_A_TIME_H */
diff --git a/arch/s390/mm/extable.c b/arch/s390/mm/extable.c
index 812ec5be1291..30e4b96be207 100644
--- a/arch/s390/mm/extable.c
+++ b/arch/s390/mm/extable.c
@@ -61,22 +61,6 @@ static bool ex_handler_ua_load_reg(const struct exception_table_entry *ex,
 	return true;
 }
 
-static bool ex_handler_zeropad(const struct exception_table_entry *ex, struct pt_regs *regs)
-{
-	unsigned int reg_addr = FIELD_GET(EX_DATA_REG_ADDR, ex->data);
-	unsigned int reg_data = FIELD_GET(EX_DATA_REG_ERR, ex->data);
-	unsigned long data, addr, offset;
-
-	addr = regs->gprs[reg_addr];
-	offset = addr & (sizeof(unsigned long) - 1);
-	addr &= ~(sizeof(unsigned long) - 1);
-	data = *(unsigned long *)addr;
-	data <<= BITS_PER_BYTE * offset;
-	regs->gprs[reg_data] = data;
-	regs->psw.addr = extable_fixup(ex);
-	return true;
-}
-
 static bool ex_handler_fpc(const struct exception_table_entry *ex, struct pt_regs *regs)
 {
 	asm volatile("sfpc	%[val]\n" : : [val] "d" (0));
@@ -104,8 +88,6 @@ bool fixup_exception(struct pt_regs *regs)
 		return ex_handler_ua_load_reg(ex, false, regs);
 	case EX_TYPE_UA_LOAD_REGPAIR:
 		return ex_handler_ua_load_reg(ex, true, regs);
-	case EX_TYPE_ZEROPAD:
-		return ex_handler_zeropad(ex, regs);
 	case EX_TYPE_FPC:
 		return ex_handler_fpc(ex, regs);
 	}
-- 
2.53.0